[clang] [Headers][X86] Add constexpr support for some AVX[512] intrinsics. [Headers][X86] Add constexpr support for some AVX512 masked extension/truncation intrinsics. (PR #161984)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,c -- clang/lib/Headers/avx512vlintrin.h clang/test/CodeGen/X86/avx512vl-builtins.c
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/avx512vlintrin.h b/clang/lib/Headers/avx512vlintrin.h
index ae531f461..965741f0f 100644
--- a/clang/lib/Headers/avx512vlintrin.h
+++ b/clang/lib/Headers/avx512vlintrin.h
@@ -7368,8 +7368,7 @@ _mm256_cvtepi32_epi8(__m256i __A) {
 }
 
 static __inline__ __m128i __DEFAULT_FN_ATTRS256
-_mm256_mask_cvtepi32_epi8(__m128i __O, __mmask8 __M, __m256i __A)
-{
+_mm256_mask_cvtepi32_epi8(__m128i __O, __mmask8 __M, __m256i __A) {
   return (__m128i) __builtin_ia32_pmovdb256_mask ((__v8si) __A,
               (__v16qi) __O, __M);
 }

``````````

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https://github.com/llvm/llvm-project/pull/161984